I have used four different radios for my Parks and Summit activation’s.
By far the majority have been done with either of my two KD1JV rigs the MTR and ATS4. Both these rigs run on little power and their compact size makes them quite portable. Batteries are external and if required the ATU is also external. This does make set up a little more time consuming but does provide other advantages such as rig cannot be turn on by accident in the pack, and an external ATU allows the active part of the antenna to be placed a little bit further away from the operator.